| 摘要 |
PROBLEM TO BE SOLVED: To provide a roller bearing capable of smoothly supporting an upper and lower turret tables in a punching press machine for a long period. SOLUTION: In the bearing device, turret tables 82 and 84 are rotatably supported around turret shafts 81 and 83 in a punching press machine 10 through the medium of the roller bearings 13 and 14 including an outer ring provided with a raceway surface on the inner peripheral surface, an inner ring provided with a raceway surface on the outer peripheral surface and a plurality of approximately tapered rollers disposed between the raceway surfaces, with the rolling surface formed by projecting generating line. The center part in either of the respective raceway surfaces and rotating surfaces of the respective rollers is formed by the first generating line with a certain radius of curvature. Both end sides adjacent to the center part are formed by the second generating line with such a radius of curvature as separates from the other of the respective raceway surfaces and rotating surfaces of the respective rollers.
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